[Lustre-devel] IPv6 NIDs
Nathan_Rutman at xyratex.com
Tue Oct 11 10:26:43 PDT 2011
On Oct 11, 2011, at 6:20 AM, Eric Barton wrote:
> I'd like to canvass thoughts on how big an IPv6 compatible NID
> might be. We'd like to start anticipating changing to these NIDs
> so that current development at least doesn't dig us deeper into a
> hole (e.g. on the nidtable entries sent over the wire in
> imperative recovery). So here are some suggestions....
> Current NID: 32 bit address-within LNET + 32 bit LNET number
> 64 bits / 8 bytes total
> IPv6 compatible NID:
> 1. Minimum: 128 bit address-within-LNET + 32 bit LNET number.
> 160 bits / 20 bytes total.
> 2. Hedge a little by reserving an additional (say) 32 bits for
> something we've not thought of yet and keeping the total a
> multiple of 64 bits to simplify alignment.
> 192 bits / 24 bytes total.
> 3. Hedge a lot with a nice round number.
> 256 bits / 32 bytes total.
> (2) gets my vote currently...
The cost of the bytes is so minor compared to the cost of revving the protocol, I vote for 3.
BTW, Isaac is starting to look in to how much work it would be to rev the protocol for full
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